That article I linked above suggested an alternative to making the ties out of foam sheets. A 9" x 12 " x 3mm foam sheet package of ten costs around $10. Darice 1189-27. They also come in larger sheets.
Each 9" x 12" sheet will make (96) 1/2" x 2" x 3mm track ties. That's nearly 1000 ties for around $10 already colored black. I cut mine with a paper cutter.
If you fasten the track to the board they will stay in place without gluing them to the bottom of the track.
Here they are on a temporary holiday layout: